More tests.

tests/__init__.py

@@ -107,16 +107,6 @@ def http(*args, **kwargs):
         >>> r.json is None
         True
 
-    $ http --version:
-
-        >>> r = http('--version')
-        >>> r.exit_status
-        1
-        >>> r.stderr.strip() == httpie.__version__
-        True
-        >>> r == ''
-        True
-
     """
     env = kwargs.get('env')
     if not env:

tests/test_httpie.py

@@ -19,6 +19,11 @@ class HTTPieTest(TestCase):
         assert r.exit_status == httpie.ExitStatus.ERROR
         assert 'https://github.com/jkbr/httpie/issues' in r
 
+    def test_version(self):
+        r = http('--version')
+        assert r.exit_status == httpie.ExitStatus.ERROR
+        assert httpie.__version__ == r.stderr.strip()
+
     def test_GET(self):
         r = http('GET', httpbin('/get'))
         assert HTTP_OK in r